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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300febf8ebc8b1a73c50026425c92f008637e74da7ab01785c6a21029585d2a4' 
  AND token = '6P8lOluY0vcCcNEENfT4mHMmsfcj4pwfTS/OZ/Lxrbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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