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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58d135b6e88efed87d0258ff11835731f4d70f479df64872c84e01c1af2a5b2' 
  AND token = 'qtzybIxZrotwFZpP6g6r7Bl0lbgs3Z6EMfmhMrYRDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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