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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e818d4abd4b127bc1b72b5192e511fc78233c3d29eb32b1f0086edff45c185' 
  AND token = 'DMTrj5W+KLuLYfQZG7M2ytQO5HczsasQIeOcZuydwuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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