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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd361e2ab3497006e649de96b0c44f101a3d4705c668f3aeb34a3aba170230f10' 
  AND token = '3QCrJbzil/y8q38+FIun5I5RKpFbXtr9iS82jadNsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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