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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2531c3d50a7fe3e8dc32807ba6f974b222bc89e5334bcec87693be937052394' 
  AND token = '3Rdc4wjkfhc+UmRtOk7xAWZfvDQhreH8962XopL1u+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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