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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbccccc2228839dcfdbd2d083cbd4bb1ebd12ddf6d3c0b6eeab7e8aaf51bb1c' 
  AND token = 'F7AdE3VyR1wkGKwI5dJQf4mechUhB2U1iL0uCCLlwlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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