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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30a1d87b942d46bda5c62c493c8b7c46782d8e9318a6a04c1a762b7e059b116' 
  AND token = 'hXDmDfTrtOW+uyTTBha1A0k+GJb8kv1FHmz+50qfbqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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