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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaced014ed389232f343e937fbf9b4560e259f18d34bcfb39b0f50e7fc28240' 
  AND token = 'hMymgqaSVqe/gGECSSJi3HdKHIzTVZa7NkxGXcWtjRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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