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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07bcd879da1807a1517290a86d6db44847eb7a25453f1450de1c3f0a5125fb5' 
  AND token = 'N95GPpXpeWy5XVtJ+Tsd7lL6Gn9PVsacbFKR+rl3DDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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