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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331b88b22ea7ff0a6f80a48286414d7a894bcb110bde4dffe57d2c0daf3c6c91' 
  AND token = 'ewo86PyedgathCCKwnW/EP9KwGkLQY1tLF6iPyIRG64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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