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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde861b22b9240d2ccb9e44be14e0e24cbf78456e90babb586e06daf3bff0994' 
  AND token = 'ZibpVwHB01wUpydrds82vixfaBcNVe2/WKONoHL33eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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