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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003c565cc40f334226da6d4088cf5619ad5b8b24c8040bd926907769d3401346' 
  AND token = 'Fe31P/4yx+5kaN3kSfvIZhe4rN4xKMeh1ygP/OfNr0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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