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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd93884777b9849a4916a9cbf0be9aefd2d7d03d1bf7f5c0450f87fda7bf16c4' 
  AND token = 'KRRttMONEFQQ646jzcF4XUlUblvVFAOBbQf2bWFOIJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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