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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3827299c6790dfd7767fd1d8dbd5f9eb3d642a542e75ba550ab2bbd9783d1ceb' 
  AND token = 'KlJJ26iewjTEVQkJVMuxJxLg43o4q2M7rmSE80PRA1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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