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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdb9d68b1881e168160f8b3c521be34cd5de75b0add4066330aec72415fddca' 
  AND token = 'm4Z3w9I4kzbBQ/QCHz8/tRZZ8g/u+4g3quh/INcOlfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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