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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2567e435efe6822adb2fcd15dc21b06a6e15ed87f2cfa02d70065f9ac6c832' 
  AND token = 'lIV8n0TLCldlRM3yH5M7NlVlKJC8iu/kLNJnY1j5U1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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