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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f08371f8578b950f1c5d4b87e3ac4553945eebc231f0ec6cdf11dd520829f9' 
  AND token = 'cUbcv09/bgryUfviOVMAj8gCbAgBTagOfPVbG3e3F4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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