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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d93727fc7fc7131fac534e0d1e01b752486736e3c4e439a13cf98b93744e08' 
  AND token = '1J57KYT1NtSQDUk5iq4txtDGjlcphj+5cwt7mzlG9Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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