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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7183f690d318b11acacb3e86e7439160d884c5dc97d006628fa4c6c561db81' 
  AND token = '3GiBPi59Oci/AxPnGb8L6dBQ/VAdMgRXYunQ/lE4SJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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