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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a014a06474638ef7c95077cd5e9fa64afc0051ff194ff30730aa9da562c3f1ab' 
  AND token = '7zmkG9xjo83VhlPFy69ASgxzuJ8ES22a/3b5yZwcmYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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