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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938c6ea1edc099b9702ff46e820268ebadc06f73a5b7175cc4c13b54bfd5a05c' 
  AND token = '58Yk+OP1rCi7kty31+zy11YdPt3iIQxFF410f5al+BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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