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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92714e8f9342f1cd6523893abe8db2088065d56072591b03de24807aa03bc012' 
  AND token = 'olhDpVABGkVnH18dB33a7D46GsH3t+PsUAnjo2u8vBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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