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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf315a913562d54e97be1514f92069089ba4ad6579354ab44f13aaa3eab272e' 
  AND token = '3aIIdOYh0XN2cdt9cd/ZyjvjrrIg8PMEoh4R9kQATRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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