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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5571e19ba9961269400a64dff4f0bf2cf70bc5a03cc5da333400f2300cef293' 
  AND token = '4zX/sxNf2TuRbgQsswOmGN7uaV9xRBi5f4/gXq8U5CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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