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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2cd7dfc4ddaa3f1f6e5db47384ec5b1871599e0cbc8e0dbbf4241eb4f7ae7f' 
  AND token = 'el42XMuwr2fuWCOlXodkF0g7//1CBbK/8o/3W3JdTWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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