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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fcc0587c6d6b07f55fbd6adbc090c87b1a64877d34dc648f2a16288238e466' 
  AND token = 'zgKyU6FlOUcZJJy42Hd62ghzROCFjzrLHTiB4HgyfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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