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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cad3a8ccac00a9f4ef0b6da436bea3599940578a2dff1a3f8c0f24ec53d583' 
  AND token = 'pIWydykRd7w3F2/lcZPXkfFXETpmFGk7m8Fu4MW4nbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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