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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3095aa9d4ffa36abfd90e9b4c62f32661cab7648e7fd17ea8c18af1d402e2fb9' 
  AND token = 'ZnB5gUbAf6bv3qQIPBQ81EPRC91kse7QMSTuxeT4wK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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