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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9b6c8e3b0f13cc2d452567fa89f3624c1b3c1c6ec65fc979caf32f81bcb30e' 
  AND token = 'k2f7fibm/qkBQO1nDQKQCfJ/eNJ/cmiYNXDr65qeqDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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