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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d36795a0777b1468cfd545a2d16898020d60f2c2f6cc813eda120291a30bdf' 
  AND token = 'jJGrA7WZdkIumQOE2wJvUUtPVU8iI/Byox1E+AxLm8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}