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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bb7cb871593d08c68818547186c55a95749bbfb3d95bf16da1cf58ae626a9d' 
  AND token = 'ZUq7Na1BJx4AMlUGWF5aibkc2bfgRyu+Ig8+beZeKsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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