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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a5a9e9a56b8075ce91be040fd12665b8cb12447be79e630731f2ff4928bcdd' 
  AND token = '8l39nEikfshWhaJbjkCDgkw5ddLjWVwZmrXXiau9nLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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