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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e356b6905a3c5377bd9d56ad15f76332811a9c4f5eb46aee87d473e43f6096ef' 
  AND token = '5wt0tXdxDOVsfCr7go4Xc5JkSTy2dfNMBTHupX9w8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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