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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c4d9dc88e71c5c0cc2f74fc78443ebbe141d5a40cf1dff1d3c82fbd2b47c94' 
  AND token = 'nQXE5Z8lekXu95PgZXVHie98/I58ZPcHK6S20apRWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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