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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4a1211f0d333fbb9f95d2caad3ad548c7f1dc18956ebb7983616497ea2b98a' 
  AND token = '3OSfOCZJqq1lRNWQcvTDouUvOn61PE6MVqODCuB3dIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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