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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24f7875ca4900615cce6224ddc4abad2652731c35d0537389134a53c2774a27' 
  AND token = '7x/Oe+u/LGH6TZMzXqWHMU03jVpcyCUuAmad3HS4L5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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