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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c449a273102e1060e4aaa7b4df4582292bce88e2cbdad06b68c34a51c779d9d' 
  AND token = 'k2DH5O77Gogsb57q+UNjGHWMGmLalchID787IcO0NwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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