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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b12e90c3ab34ccc3d3f214d6033bce669dadaa4dc80ee441b5e8bd078da67d' 
  AND token = 'GmCjfncERn0wK5hkLlH2pgk4cNxQBaRU7MKVemKT1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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