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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e7d8e0a1f27a4d70694e81528610129dcbc60d84fe6e6873fe7ea9a67efa5e' 
  AND token = 'sWaQ5vhg5cRpBRQxkGXpekbWHuS4qxD9/YC61swTviE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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