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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4408b44f771c3167270593771dfaeb4173dd1fbe97b92aa797bc73ebe78972' 
  AND token = '1AN7ND82JhzVK/OTLeiSR6UJtUJ1LX7vg4SF3gjQrlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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