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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ecebb87fbc747b0488076efd80218de93bcb6da338293a33f538d7a5143240' 
  AND token = 'dG909Gabh+8n6bFrjXmdel+QG18BVrSKQJrWvLxRUhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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