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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49f68f97d0bbe0475e0a759c5a47074d8edc3a03ef8635ecb956457d24977f0' 
  AND token = 'zUr24ZNavYYHi0q96Islzw85kSl5R7M8jNZTwbF08mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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