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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42da60152ca32a51051cb789f99711ebd928bb255f2ab09dfb0a82d9548d6a5c' 
  AND token = '7RDnSXyFmkFGm/ZYfHaCrCf3nd3sIXXv5hM5r67AP0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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