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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc91a514d15df94c33bb7df4d6ee7e3696e8c5f3e9627085a81e4956784c6331' 
  AND token = '9fIK3xdx36WxIOuvbRHbejO8CuKL51fK5kSBcAiF1zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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