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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a933e24b45094bba76e4c15b5e6e7f3d792c1b7a4ad26ef7cc9603f2ebe10c' 
  AND token = 'qS3DTtoXugHdronIaEuFDxtyzKIeMUTVtKcbHEPc8L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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