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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e44b949797bc447ae4fa0376d779d84c610eae0efcab2e0304810a27154b691' 
  AND token = 'FP+hQ7VOoiv5nyfCwP+2xPY8PvxoKkzHd5ySmZIakrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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