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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8cbcbdbc202ee6e31ec20f8348a54bbdc604d73a203c44c145ea1e8f2933f0' 
  AND token = '1bSXJzowdisBbdZ2TqWY4eqGx7f1TP9X85E2PFOgAQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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