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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c300bf895964aaecf69a22027ee0dc770689248f88db647677a42b4474b4ee9c' 
  AND token = 'lX2ybPmlEUrQU4orVDfcFZ8GP9vxdEEOY4796f8AdC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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