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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c127a041a9923430f675ee250a998870106c0148e2e9e621a14f5c75d467f68' 
  AND token = 's4EGerUfxengUJ36QTPPCYmZomqtv/3EQ/p0w5dj7ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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