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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e931b8fe0ce27f5a3cfbc002126a59dd4c8b977258e1975c7a50973f5731a6c' 
  AND token = 'mlS7EoRj3geASgLLMwf9Lr6ySKwg9EbeV44ckbeYtQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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