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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f8dc9be29f2e1a58adfcf2628061bb4971d4022a509066ab473f3b113ada40' 
  AND token = 'eKf2zzsCop4LEpJ4MewwfT9rKHikp2mHKcfH7oXD1qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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