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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be325744e4f5f1ec5d8274d804e5f9f41d4ce44c5dd01fccf62d67f3196b519d' 
  AND token = '4AYPbu02awsxKbGUM2KnF5ltws5iI3rkodSl/7MlPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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