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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97203057dfbdece4771aa2f741e56c1c375f1e8a5e2b6dce16d4add0f367d97a' 
  AND token = '6BNSuwkmGas7m4Dl4hshH55K5DWyhZE7Mjoy+1okU/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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