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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05949b90c4f4e630ea8fac51495b7490000ffaf6bf63ce22a0518d4926d07446' 
  AND token = 'FhLQRlXUBOsdnlhndXj4MmFi+C7s4+NvpYGWNab4yYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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