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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b6279114f9ca638a3ca1f4680a4a0537e96f6b118128ff645330d05c5bede6' 
  AND token = 'U5Jafe87ZKaQlCcpqTlCT7dmDq8mqhA5oaqLhq0uut4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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