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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c8f1dd1433984ff87a55fd7f960661dba708ae9a875f07c42d8887dd28257a' 
  AND token = 'Fmf3fMV4w6A++uF4ZATeGDuO183naqRaD/K9ic50nPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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