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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72f002ed6030e608e38332530da9cfe28e2fe4ce32c76aca3373b4d863a544a' 
  AND token = 'LQlhXFevwbAh6+efLsMMNOzk7ZvywvSGlbJP7WBjis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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